高架绝缘斗臂车接近和离开带电部位时，应由斗臂中人员操作，下部操作人员应离开操作台。

∮95mm减震器的最大外径为（）mm。

Fill with the proper words. 根据句意每空填上一个适当的英文单词。

1. English is an important working language of the _______________ meetings.

2. Wang Nan and Zhang Yining are famous _______________ players of table tennis of China.

3. Many children learn to play the _______________ in the Children's Palace at weekends.

4. Miss Liu is our maths teacher. Her _______________ is next to our classroom.

5. We Chinese people made many new _______________ in 2008 Beijing Olympic Games.

下列物质全部属于纯净物的是

A．福尔马林、白酒、食醋

B．甘油、三氯甲烷、乙醇钠

C．苯、汽油、无水乙醇

D．二氯乙烷、聚乙烯、聚氯乙烯

学生的主要任务是 【 】

A．学习

B．人际交往

C．升学

D．参加社会实践

会计档案可以即时获取并维护，按F7能查询到（）

A.会计科目

B.模式凭证

C.核算项目

D.摘要

E.往来业务编号